is the father of 741, the first and great operational amplifier...all others came after this guy had the idea.... very important man for our civilization.

That finger is a very important message....you have to sit, and being relaxed, think about...ahahahahah!... that guy could show us that digital sistem can be understood as the digit one.

He is right... see the waveshape result when you connect 192 Khz sample dots into an audio waveform...connect these dots and watch....imagine you gonna have some rounding edges connecting a capacitor to smooth the decay and wave shape rise....imagine again if that thing has some relation with the original..no way!

Project

I found that if we inver an electrolit capacitor, we call electrolit condenser in Brazil, even if this invertion feeds a small voltage present at the multimeter probe tips...then something happens with the dieletric...maybe a hole or a short...small atomic connection i think....then, after that... you put the
unit with the correct voltage and polarity and as a result it starts to show leakage, some resistance appear... less than infinite... some current starts to flow..the unit start to become warm and then hot, to acumulate pressure of gazes ....and at the end may explode ... this is progressive and takes time...i found that if you invert for a couple of miliseconds, the unit is dead and should go to the trash box otherwise will create to you problems in the future.

Message means...if you invert them...even if the invertion time is short..the unit will not work well anymore..you may junk the part.

I was starting to read something about..but i was interrupted by a phone call and them i forgot to continue to read.... if i can remember the voltage needed to harm the electrolitic capacitor is less than a volt..... well...i have to check..not sure.... was online, a paper about electrolitic fluids and capacitors.

Carlos

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Do not waste your time in a second place..go to the best..search in this forum by a Dx amplifier and build it

They prefere the direct contact with the salesman at the shop counter...they love to put their hands into the component and to observe the weigth and the shape ... they love to measure the DC gain despite this does not helps very much..well.... this is the way they love.... majority of us loves the human contact the shop at the neighborhoods..... Mr. Zé (Joe) shop.

Because of that they want to know if they can use the most available transistor we have down here.... what they have to do to use MJ15025 for instance...or to use TIP36, or 2N3055, TIP3055, MJE3055, 2SC3281A, 2SC5200, MJL4281A, FLJ4215, MJL23194 and so on.

I am making some studies, at least with the units i have tested, to know what is the maximum voltage they can operate in the safe area..also the impedance.

The idea is to say:

If you want to use TIP36 and complementary, then adjust your supply voltage to 36 volts and it is better to use 8 ohms loads.... 4 ohms may be dangerous if you distort to 10 percent and 2 ohms is forbidden.

Hard work to me..but they gonna feel better having options.... they also will have the kit of parts to populate the audio amplifier pcboard and the Dx Supply parts too....maybe not all them..but the small ones, resistors and capacitors may be included.... we are not sure if we will put power transistors (their choice) and capacitors (also their choice to buy chinese units or not to buy Chinese capacitors, called here "ching ling"

I will make a video about that...maybe two..one in Portuguese and other in English studying, at least, 12 different transistors.

I understand that some guys are shy, other may be selfish, others may feel scared to ask too much simple questions... do not worry, everything is simple in audio electronics.... please post your questions.

I feel deeply bad when i answer things that may interest to hundreds and only one is having the advantage....i feel myself selfish, unfair and very unconfortable to be talking one by one... this is deeply inneficient and goes against my personnal need to help thousands at same time.

When uncle charlie was very young, used to build amplifiers (more than 5K built minimum) and 8 to 10 exploded in front of my face.... wrong circuits, wrong designs, wrong magazine revision, defective printing.... well.... human failures.... then i used to write letters (we had no internet....was telephone, telegraph and mainly letters the communication... sometimes Ham Radio but was exception) ..... writting letters to the designers and Engineers i was snobbed many, many times.... they said (not time to help you)...other said i could not understand because too much young (had not high school)..... this made me angry against designers and Engineers, at least in Brazil.... in foreign countries i had some answers from UK and USA... some help from them....i decide that "one day i would lean and became good" and gonna stop their dirty domination teaching everybody how to design... finishing with their arrogance....and i did it in Brasil..... now a days.... 180 million people, there's no more than 4 guys that know more than i know... and my people is not stupid anymore the way i was.

Carlos

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Do not waste your time in a second place..go to the best..search in this forum by a Dx amplifier and build it

Yes junior I'm thinking to get me another batch order, and I want to try other color option I'm thinking maybe red for now, as Carlos keep me update it with some minor changes, this order will have all the updates made already. So this
will be in the future, I will announce when I think I'm ready, this is more like "personal buy" but if some one is interested to get a pair please let me know.

When I say red maybe can or not be red because, Vivian can not understand much English I ask her a couple of time and she replay "yes,yes we can make it red both sides...", I say, "that is what you told me last time", jejejejeje but please do not alarm this order will be in the future do not panic is a not a "now" maybe in a few weeks.

amplifiers from Dx line coloured red, green and blue....so...white is the one was missed...or maybe black with white silk screen..... the problem with black is that shows dirt because contrast.... dust usualy is lighter than black and by contrast we can see it clearly.

I am already happy because in Brazil i gonna have white pcboards...so...you can make your choice.

I would like Juan to produce Dx Supply pcboard too.

regards,

Carlos

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Do not waste your time in a second place..go to the best..search in this forum by a Dx amplifier and build it